Hi
Have you resolved the problem with your car alarm. I am having the exact same problem and cannot understand why its going off. Nissan is charging �78 just to look at it but not convinced they can help.
At the moment i am making sure the sun screen is closed on the roof and by blocking the air vents at the front of the car every night it seems to stay quite although doesn't look great with towels and coats shoved down the front windscreen.
Please let me know if you have solved the problem as my neighbours will also appreciate it,
Thanks